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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Components of net pension expense were as follows:
Three months ended September 30,Nine months ended September 30,
 2020201920202019
 (In thousands)
Company-administered plans:
Service cost$2,967 $2,449 $8,921 $8,264 
Interest cost17,463 21,301 52,348 64,165 
Expected return on plan assets(24,304)(22,350)(72,515)(67,615)
Curtailment loss6,303 — 6,303 — 
Amortization of:
Net actuarial loss7,597 8,170 22,749 23,212 
Prior service cost187 167 559 533 
10,213 9,737 18,365 28,559 
Union-administered plans2,769 2,718 8,346 7,876 
Net pension expense$12,982 $12,455 $26,711 $36,435 
Company-administered plans:
U.S.$12,215 $11,067 $25,048 $33,199 
Non-U.S.(2,002)(1,330)(6,683)(4,640)
10,213 9,737 18,365 28,559 
Union-administered plans2,769 2,718 8,346 7,876 
Net pension expense$12,982 $12,455 $26,711 $36,435 
Non-operating pension costs include the amortization of net actuarial loss and prior service cost, interest cost and expected return on plan assets components of pension and postretirement benefit costs, as well as any significant charges for settlements or curtailments if recognized. During the nine months ended September 30, 2020, we contributed $74 million to our pension plans, which included additional contributions of $38 million made during the third quarter. In 2020, the expected total contributions to our pension plans are approximately $76 million. We also maintain other postretirement benefit plans that are not reflected in the table above. The amount of postretirement benefit expense was not material for any period presented.

On September 30, 2020, our Board of Directors approved an amendment to freeze our U.S. and Canadian pension plans for certain previously grandfathered participants effective December 31, 2020. As a result, these employees will cease accruing further benefits under the pension plans after December 31, 2020 and will begin participating in an enhanced 401(k) plan that is available to existing non-grandfathered employees. All retirement benefits earned as of December 31, 2020 will be fully preserved and will be paid in accordance with the plan and legal requirements. In the third quarter of 2020, we recognized a curtailment loss of $6 million in non-operating pension costs with an offset to accumulated other comprehensive loss as a result of the freeze of the pension plans. In addition, as a result of an interim actuarial valuation due to the curtailment of the plans, we recognized a decrease in the funded status of the impacted pension plans of $95 million, including the impact of the curtailment, and an increase in the net actuarial loss recognized within accumulated other comprehensive loss of approximately $68 million, net of tax.